Improvement in copper-lined boilers



W. L. BROWNELL. Copper-Lined Boiler.

No. 220,748. Patented Oct. 21,1879.

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UNITED STATES PATENQTgOFFIQE,

WILLIS L. BROWN ELL, OF BROOKLYN, NEW YORK, ASSIGNOR TO ANNA J BROWNELL, OF SAME PLAGE.

IMPROVEMENT IN COPPER-UNED BOILERS.

Specification forming part of Letters Patent No. 220,748, dated October 21, 1879; application tiled l August 23, 1878.

To all whom 'it may concern:

Be it known that I,W1LL1s L. BROWNELL, of Brooklyn, in the county of Kings and State of New York, have invented an Improvement in Copper-Lined Boilers, of which the following is a specification.

Hot-Water boilers for ranges are usually made of copper, but, on account of their eX- pense, iron boilers arelargelyemployed. These have been galvanized, but in many places the zinc is injured by the Water, and these boilers are otherwise objectionable. If the boiler is made of thin copper it is liable to collapse.

In some instances a thin copper boiler has been protected by a winding of wire soldered to the outside, and serving to strengthen and stiften the copper.

My invention relates to a copper-lined boiler made in the manner hereinafter described.

In the drawings, Figure lis a section ofthe copper-lined boiler. Fig. 2 is a partial section of the sheet meta-l before it is formed into a cylinder, and Fig. 3 is a section of the curved sheets at the joint. Figs. 2 and 3 are in enlarged size.

The sheet of iron, a, is of a size to be rolled up into a cylindrical form and make the entire tubular portion of the boiler or a section thereof. A sheet of thin copper, b, preferablytinned ou one side, is prepared ot a size larger than the sheet a, so that it may be laid thereon and the edges folded back over the edges of the sheet of iron, as represented in Fig. 2. The combined iron and copper sheets are then bent up -into a cylindrical form by means of suitable rollers, which cause the two sheets to set firmly together, so that there is not any space between one and the other, and the copper is held firmly in its proper position in relation to the iron by the edges being turned over.v The rivetholes are perforated in the sheet, and the lapping edges are riveted to gether, and the boiler-cylinderis completed and ready for the reception of the heads e and f, which should also be copper-lined.

It will now be apparent that there are two thicknesses of copper at the joint between the two thicknesses ot'iron, and that the inner edge of the iron is covered up; hence it is not ex- 'pcsed to rust, and the thicknesses of copper form a packing for the joint. It is preferable to calk the joint by a tool driven against the edge of the copper. I usually cut off any surplus copper, so as to calk both the edges of the copper, as at t'.

I remark that steel may be used instead of iron, and that a sheet of brass may be employed outside of the sheet of iron or steel, if desired, or the lining may be of brass or other metal that is the equivalent of the copper.

I am aware that sodawater fountains have been lined with sheet metal, and that portions of such fountains have been bolted together. The lining, however, did not pass in between the surfaces, but the same had to be made separate from the vessel and bolts used instead of rivets. By my improvement the edges of the sheets are covered, and the parts are capable of being riveted together in the usual manner.

I claim as my invention- The copper-lined boiler, having the cylindrical portion composed of an outer sheet of iron, lined with a sheet of copper, said copper being folded around the edge of iron and the lapping edges riveted, substantially as set forth.

Signed by me this 20th day of August, A. D. 1879.

WILLIS L. BROWNELL.

Witnesses WILLIAM G. MoTT, GEO. T. PINCKNEY. 

